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Finding the Fourth Proportional to 1,040.05, 1,560.09 and 631.81

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Solution

The fourth proportional to 1,040.05, 1,560.09 and 631.81 is: 947.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,040.05 : 1,560.09 = 631.81 : x
  2. Step 2: Convert to fraction form
    1,040.05/1,560.09 = 631.81/x
  3. Step 3: Cross multiply
    1,040.05x = 1,560.09 × 631.81
  4. Step 4: Simplify right side
    1,040.05x = 985,680.46
  5. Step 5: Solve for x
    x = 985,680.46/1,040.05
  6. Step 6: Final answer
    x = 947.72

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.